Method of forming emery-wheels



(No Model.) 7

S. G. HODGES. METHOD OF FORMING BMERY WHEELS.

No. 467,254. PatentedJan. 19, 1892.

vfneseea UNITED STATES PATENT OFFICE.

SCHUYLER G. HODGES, OF PONTIAC, ASSIGIYOR TO THE ACME SAFETY EMERY WHEELCOMPANY, OF DETROIT, MICHIGAN.

METHOD OF FORMING EMERY-WHEELS.

SPECIFICATION formingpart of Letters Patent No. 467,254, dated January19, 1892.

Application filed June 15, 1891. Serial No. 396,348. (No model.)

To all whom it may concern.-

Be it known that I, SOHUYLER G. I-Ionons, a citizen of the UnitedStates, residing at Ponnae, in the county of Oakland and State ofMichigan, haveinvented certain new and useful Improvements in the Methodof Forming Emery-WVheels; and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

My invention relates to an improved method of forming grinding-wheels;and it consists in the certain peculiar features of construction andarrangement of parts more fully de scribed hereinafter, and definitelypointed out in the claim. I

The object of my invention is to form a grinding-Wheel of emery oranalogous material in such a manner that the danger of breaking orcracking is in a measure overcome and the connection between the web andhub improved.

IIeretofore it has been the practice to mold the material of which thewheel is made into the groove of a hub, one wall of which is detachable,and which is secured in place after the material is packed in the mold.The material is then allowed to become hard. In this case the dryingcauses the material to contract and the wheel becomes. loose on the hub,and it is quite impossible to get the flanges perfectly true. It hasalso been the practice to pack or mold the material in a grooved fellyand allow the same to become hard, the material in this case being in athin layer. In my improved method I seek to overcome these as well asother objections heretofore existing.

I have illustrated an emery-wheel produced by my method in theaccompanying drawings, wherein- Figure 1 is a perspective view of a hub,and

Fig. 2 is a vertical central section through a complete wheel.

A represents the metallic hub; B, th e flanges; C, the web; D, the boreof the hub, and E the securing portion of the web.

I first take a grooved metallic hub having its flanges at the sides ofthe groove made integral or permanently secured to prevent any movementof the same. I then place the hub in a mold, the inner face of the underflange being flush with the bottom of the mold. I then force into andfill the entire groove between the flanges with the material to conhub,is subjected to a gradually-increasing degree of heat until the bindingagent fills the interstices of the wheel, and owing to the heatedcondition of the hub the material adheres thereto. The wheel is thenallowed to cool in a temperature of about 80. Theiron of the hubcontracts more than the mixture, owing to the fact that the intersticesbetween the particles of the mixture have become filled with thesilicate, thereby tightly binding the material in the hub. The adhesionof the material to the hub prevents the same from becoming loose on thehub when the same is rotated at a high speed and pressure is brought tobear on the periphery. The gradual heating of the entire wheel,including the hub, l have found makes a complete, solid, and permanentunion between the web and hub Without bulging, cracking, or in anymanner affecting the condition or shape of the web.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

The herein-described method of forming grinding-wheels, consisting offoreing'the material of which the Wheel is composed into a groove in ametallic hub, subjecting the material and hub to gradually-increasingdegrees of heat, and finally permitting the same to cool, substantiallyas described.

In testimony whereof I affix my signature in presence of two witnesses.

SOHUYLER G. HODGES.

